Chimney-cowl



I (No Model.)

P. W. SIMMONS.

GHIMNEY GOWL.

No. 588,492. I Patented Aug. 1?, 1897.

IN VENT EFF. fwmm wwm ing to Fig. 1, but with two of the vanes sub-.

UNITE STATES;

PATENT OF ICE.

FREEMAN W. SIMMONS, OF CLEVELAND, OHIO.

CHIMNEY-CQWl...

SPECIFICATION forming part/of Letters Patent No. 588,492, dated August17, 1897. Application filed January 7,1897. Serial to. 618.272. im r) Toall whom. it may concern:

Be it known that I, FREEMANNVSIMMONS,

a citizen of the United States, residing at Cleveland, in the county ofOuyahoga and known as chimney-cowls; and the invention consists in achimney-cowl constructed substantially as shown and described, andparticularly pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figurel is a perspective view of a chimney top or extension andacowlsurmounting the same embodying myinvention in one of several practicalforms and with all the vanes open. Fig. 2 is a perspective view of theconstruction correspondstantially closed. Fig. 3is a perspectiveelevation of a modified construction as compared with Fig. 1 and inwhich the vanes are rigid with the chimney extension instead of pivotedthereon and connected with which are other top, fine, or extension, asalready described,

ing its triangular cross-section, thereby exposing sharp angles andsharply-retreating sides to the Wind and providing a suitable passagewithin. The present construction may be considered as of metal,galvanized iron serving a goodlpu'rpose. This base for the cowl properis the same in all constructions, and by reason especially of its shapecoacts with the cowl in carrying out the functions of the invention.

Referring now to Figs. 1 and 2, I'have the same parts present but insomewhat different relations. Thus in Fig. 1 are shown three severaltriangular vanes or wings a, b, and c, pivotally supported along theedges of the three several sides 1, 2, and 3 of the base A. Almost anysuitable pivot or hinge connection of these vanes may be employed, andeach vane is provided with its own counterbalance or weight, located inthis instance at one end of the vane, and, as shown here, comprising aright-angled projection 4 with a nut 5 adjustable thereon and serving asa movable counterbalance to make the vanes more or less sensitive towind disturbances. Ordinarily, or even when there is a fair movement ofair, itis' found advantageous to keep the vanes open, as. in Fig. 1, butwhen thehowever, should the closing be sufficient to make any materialdifference in the size of the smoke-outlet or so as to choke the outlet.This effect or result, however, is averted in part by reason of my novelconstruction and arrangement of vanes. It will be noticed that when theyclose they close toward each other and the center of draft, and at thesame time assume aninclined position. This forms upward-glancin gsurfaces for the wind, which stimulates the draft. Then to avoid an eddyor dead-space behind the closed vanes Iso construct and arrange thevanes in respect to space between the vanes, when it tapers, as

in this case, with great advantage in clearing the top of the-chimney ofsmokeand promoting a healthy draft back to the fire. A suitable stopshould be provided for limiting the inward movement of the vanes. Thedirec tion of the wind will of course determine which of the vanes willbe closed, and experience has shown that it rarely occurs that one vanealone will be pressed down while the other two remain open. In factthere is liable to be a play of the vanes between the extremes of theirpositions if the wind is unsteady or changing, or insufiicient toovercome the counterweights, but in all cases they are found to respondwith sufiicient promptness and fullness to meet the varying situations.This is true even if the two vanes aifected close to diiferent extentsand more or less in proportion to the pressure upon them.

In Fig. I show a modification of the invention in which the vanes orupward'projections g are rigid with the base A and therefore arestationary. They, however, retain the'triaugular shape with thepointsatthe top, and they may be more or less inclined inward or outward, butan inward inclination is better, if it does not unduly choke thesmoke-passage. Then in the angles or corners of the vanes g are arrangedangular and pointed deflectors h, which are constructed on the samegeneral principle as the vanes, and are largest at'their base and taperalong both edges toward the top 'or point of the projection. In thiscase I rely with special stress on the triangular principle to controlthe air-currents, and find that though there is no movable part subjectto the wind and adapted to close against its action there is perfectclearance of smoke and a healthy draft under all circumstances. In thiscase, as well as in Fig. 1 and in modifications or forms of the device,I employ a hood H of triangular plan view corresponding to the outlinesof base part A and having, preferof the vanes. These hoods are supportedby suitable rods 01'- posts m at the corners of the base A. The hood isof course more especially intended to protect the chimney fromdowncurrents as are liable to occur where chimney-tops are beneath thelevel of adja cent buildings as well as from other causes, but they alsoserve a useful purpose in conjunction with the vanes whether pivoted orfixed.

What I claim as new, and desire to secure by Letters Patent, is

1. In chimneys, a triangular top and a triangular upward projectionsurmounting each side of the top, substantially as described.

2. A chimney-top triangular in cross-section on its outside and atriangular projection on each side of the top forming acoutinuation ofthe sides thereof, substantially as described.

3. A three-sided chimney-top and a flat triangular upward projection oneach of the sides of the top and on a plane substantially with theoutside thereof, substantially as described.

4:. Athrec-sided chimney-top, three several triangular vaness'urmouuting said top and a triangular hood over the top and vanes,

' described.

VVituess my hand to the foregoing specification this 225th day ofDecember, 1896.

? FREEMAN NV. SIMMONS.

\Vitnesses: H. T. FISHER, R. B. MOSER.

